law enforcement offials say it could not be a more dicey, serious situation. also, george, we're also being given some guidance that law enforcement officials believe that these men were forced to ground in part by the release of those pictures and the video yesterday that created massive pressure on them and some law enforcement officials say that's why they took the action that they probably took last night robbing that 7-eleven. >> and, pierre, these guys were armed up, not only the firepower, the sidearms they had but grenades and another pressure cooker bomb. >> reporter: yes, one law enforcement official said at least one pressure cooker bomb was found at one of the crime scenes and, again, the scene of them throwing grenades and bombs out of the windows of their cars as they were shooting at police, one official said it was like something out of a movie. >> we know that boston is a city on lockdown right now. the situation is so tense overnight that one of our own abc news producers was apprehended by police and detained and questioned. abc's linsey dav